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Glad to hear someone with some seat time putting an DET (KA or SR) into SM. Are you running any tour events?
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I don't think I'll do a tour in the 240 this year. Can't leave the camaro at home for a big event. Especially since I've not done too bad in CP, place 3rd and 4th in the last two tours (Meridian 2000 and Houston 2001). I plan to run the 240 at local events and in our state championship series, the Trans Louisiana Autocross Challenge (TLAC). Forgot to mention the motor in the 240 is an SR20DET. The plan is to at least run an S-AFC and a boost controller on it this year. It still won't match the camaro's power, but it'll be a lot of fun.
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i don't know how much power you are making, but i still wouldn't say a 245 tire would be the minimum you should buy. i would still recommend a width from 235-255. especially in autox, getting those massive things to stop and start turning is a bit more significant than driving at road america.
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Well I'm trying to keep the wheels as light as my budget will allow, and I understand what you're saying about rotational mass. But, big meats win meets. Most everyone in ESP is going from the 275/40/17 tire they thought was big enough to 315/35/17. I know the 240 is several hundred pounds lighter than your average pony car but it's still about 2700lbs. I feel the 245 tire is big enough for now. It should be able to handle the power of the SR and the braking forces of the (eventually) 300zx brakes. Besides, I'm no little fellow, this little car is gonna need big tires with me in it!
The first autocross of the season locally is in february at another region's site. I'll let you know how it goes.